package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

public class RefreshToken implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;
    public RefreshToken(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate=stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取token
        String token =request.getHeader("Authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
        //2.获取redis中的用户
        Map<Object,Object> userMap = stringRedisTemplate.opsForHash()
                .entries(RedisConstants.LOGIN_USER_KEY+token);
        //3.判断用户是否存在
        if(userMap.isEmpty()) {
            //4.不存在，拦截
            return true;
        }
        //5.转换对象类型
        UserDTO userDTO=BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);
        //6.刷新token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //7.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
